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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a97af08263232bd680a39dfd0d0b5cca9a265af57128b5c64a2abd5f628fd6e' 
  AND token = 'Jz/6vKsShxWZCtfEVpgojEHiIcXJMVz2pDmQzVEIolE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}